L30 GE Multilin | Line Current Differential Relay for Utilities

GE Multilin L30 Line Current Differential Protection Relay – Product Description

Overview / Product Summary

The GE Multilin L30 is a line current differential protection relay from GE’s UR Series, designed for medium-voltage overhead lines and underground cables. It provides fast and secure fault detection, ensuring safe isolation of faults while maintaining system stability. Moreover, the relay supports flexible inter‑relay communication through multiple telecom standards, enabling seamless integration into modern substation automation systems. Its modular architecture allows utilities to customize protection and automation schemes using FlexLogic™ programmable logic, improving operational reliability and efficiency.

Technical Specifications

Attribute — Specification
Model — GE Multilin L30
Type — Line Current Differential Protection Relay
System Compatibility — Medium-voltage lines, overhead lines, underground cables
Protection Functions — Line current differential, overcurrent backup, breaker failure, reclosing
Fault Detection — High-speed three-pole trip, secure fault isolation
Communications — Direct fiber, RS422, G.703, IEEE C37.94
Protocols Supported — IEC 61850 Ed.1, Modbus TCP/IP, DNP3, IEEE C37.118 synchrophasors
Logic Functions — FlexLogic™ programmable logic for custom schemes
Monitoring Features — Event recording (1024 SOE events), disturbance recording (64 digital + 40 analog channels), data logging
Time Synchronization — GPS clock or IRIG‑B; channel asymmetry compensation up to 10 ms
User Interface — Front panel LCD with keypad; EnerVista UR software support
Operating Temperature — –40 °C to +70 °C
Mounting — Standard UR Series chassis
Applications — Line differential protection, substation automation, SCADA integration

FAQ

Q1: What is the primary function of the L30 relay?
It provides line current differential protection and fast fault isolation for medium-voltage lines.

Q2: Which communication protocols are supported by the L30?
It supports IEC 61850 Ed.1, Modbus TCP/IP, DNP3, and IEEE C37.118 synchrophor signals.

Q3: Can the L30 relay integrate with existing SCADA systems?
Yes, it interfaces directly with SCADA and substation automation systems.

Q4: How does the L30 relay enhance system reliability?
It offers high-speed fault detection, secure three-pole tripping, and extensive event logging.

Q5: Is the L30 suitable for fiber-optic communication networks?
Yes, it supports direct fiber connections and multiple telecom standards.